flattern.cpp

/***************************************************************************
                        flattern.cpp  -  description
                            -------------------
    begin                : july 2nd, 2006
    copyright            : (C) 2006 by Frédéric RODRIGO
    email                : f.rodrigo free.fr
    
    $Id: flattern.cpp 83 2006-11-05 20:46:42Z neoneurone $
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   any later version.                                                    *
 *                                                                         *
 ***************************************************************************/

#include "flattern.h"

#include "map.h"

#include <cmath>

namespace MapGen
{

   /*=====================================================================*/
Flattern::Flattern()
{
    MAP_DEBUG( "ctor1" );
}


   /*=====================================================================*/
Flattern::Flattern( const float power ):
_power(power)
{
    MAP_DEBUG( "ctor2" );
}


   /*=====================================================================*/
Flattern::~Flattern()
{
    MAP_DEBUG( "dtor" );
}


   /*=====================================================================*/
void Flattern::apply( Map* map )
{
    float min, max;
    _getMinMax( map, &min, &max );

    float coef = fabs( max - min );

    for( uint x=0 ; x<map->getW() ; ++x )
        for( uint y=0 ; y<map->getH() ; ++y )
        {
            if( min >= 0 )
            {
                map->setAt( x, y, powf((map->getAt(x,y)-min)/coef,_power)*coef+min );
            }
            else /* min < 0 and max > 0 */
            {
                float h = map->getAt(x,y);
                if( h >= 0 )
                {
                    map->setAt( x, y, powf(h/max,_power)*max );
                }
                else
                {
                    map->setAt( x, y, fabs(powf(fabs(h)/min,_power))*min );
                }
            }
        }
}

}

---